Metals and non metals

Question 1

Which are the most malleable metals??

Answer 1

Gold and silver

Question 2

Which is the most ductile metal??

Answer 2

Gold a wire of 2 km can be drawn from it

Question 3

Best conductors of heat?

Answer 3

Silver and copper

Question 4

Poor conductors of heat

Answer 4

Lead and mercury

Question 5

Non metal which is a liquid

Answer 5

Bromine

Question 6

Metal that exist as liquid in room temperature?

Answer 6

Mercury

Question 7

Metals that has low melting point ?

Answer 7

Gallium and Caesium

Question 8

A non metal that is lustrous

Answer 8

Iodine

Question 9

What are the alkali metals

Answer 9

Sodium, potassium,lithium

Question 10

Alkali metals properties

Answer 10

Soft,low densities, low melting point

Question 11

General representation of metals burning in air

Answer 11

Metal + oxygen = metal oxides

Question 12

What happens when copper is burnt in air

Answer 12

Copper oxide is formed , it is black in color

Question 13

What happens when aluminum is burnt in air

Answer 13

Aluminum oxide is formed

Question 14

Nature of metal oxides

Answer 14

Basic

Question 15

Nature of non metal oxides

Answer 15

Acidic

Question 16

Nature of aluminium and zinc oxides

Answer 16

Amphoteric

Question 17

What is amphoteric oxides?

Answer 17

Oxides that behaves both acidic and basic

Question 18

What happens when metal oxides react with acid or base

Answer 18

Salt and water is produced
Al203+HCL = Alcl3+ h20
Al203+NAOH = NaAl203+h2o

Question 19

At ordinary temp surfaces of which all metals are covered with thin oxide layer

Answer 19

Mg , Al,Zn,lead

Question 20

What does the thin oxide layer do?

Answer 20

Prevent further oxidation

Question 21

Which metal does not react with oxygen at high temp

Answer 21

Silver and gold

Question 22

What is anodizing

Answer 22

It is a process of forming thick oxide layer of aluminum. The layer prevents further corrosion

Question 23

During anodizing, what is the anode and what is it electrolyze with?where is the oxygen gas evolved?

Answer 23

Aluminum is the anode
Dilute sulphuric acid
Oxygen gas is evolved at the anode

Question 24

Metals react with water to produce what?

Answer 24

Metal oxide and hydrogen

Question 25

Metal oxides that dissolve in water further dissolve to produce what?

Answer 25

Metal hydroxide

Question 26

Which metals react violently with cold water

Answer 26

Sodium and potassium

Question 27

Why does calcium starts floating when reacts with water

Answer 27

The bubbles of h2 stick to the surface and it starts floating

Question 28

Which metal react with hot water

Answer 28

Magnesium

Question 29

Does magnesium float

Answer 29

Yes because of h2 bubbles

Question 30

Which all metals do not react with water but reacts with steam

Answer 30

Aluminum, iron and zinc

Question 31

Which metal does not react with water

Answer 31

Gold , silver , lead , copper